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Platform Edge Design

Run the function from the following locations:

MOUS_ICO Menu: Railway > Platform Edge Design
MOUS_ICO Toolbar: Railway: Platform Edge Design
MOUS_ICO Ribbon: Railway > Draw: Platform Edge Design Platform Edge Design

The dialog box 'Platform edge design' will pop up.

Designing the platform edge

The Platform Edge Design tool calculates and presents the edge of the specified railway platforms or ramps. By entering the !!key parameters!! and referring to the reference track, you will get the calculated platform edge based on predefined design standards.

Ideally all platforms are to be located on straight track sections, with no curves for the horizontal or the vertical alignments. Then the height difference and the horizontal offset between the rail and the edge of the platform construction are defined by the design standards. But as soon as a platform has to be designed in other parts of the track than the ideal, the manual calculation of the required platform edge is a time-consuming process.

The Platform Edge Design tool will ease the process to find the correct edge of platforms, whether the platform is located:

  • On a straight section
  • Partly or completely in a horizontal curve
  • With transitions combined with straight and/or curve
  • With switches influencing the platform edge
  • At a section with cant/super-elevation

Based on the current geometric situation the platform edge will be calculated against the actual requirements.

Input parameters

Reference

Select reference track and eventually which switch is to be influencing the platform edge.

  • Select reference track object
  • From Quadri: All the Novapoint objects available in the active database will be listed in the pull down menu. Select the reference track from the list.
  • From drawing: Use the button 'Pick Track <' to select the reference track from the active drawing.
  • If switch in platform area; select departing track object
  • From drawing: Mark the check box 'Switch' and select the reference switch using the button 'Pick Switch <'.

Platform Edge Geometry Rule

  • Start Station: Enter the platform start station number along the reference track.
  • Platform length <m>: Enter platform length in meter.
  • Platform height (Hp) <m>: Enter Platform design height from reference track in meter.
  • Edge offset distance (Ao) <m>: Enter offset of Platform from reference track in meter.
  • Linear increment <m>: Calculation interval on sections in meter.
  • Nonlinear increment <m>: Calculation interval on non-linear sections in meter.
  • Platform placing: Select the platform side from the pull down menu, left or right side, read in direction of the increasing station number.

Presentation of calculated result

The calculated result can be presented in the current drawing as a 2D or 3D polyline. The result will also be presented in a spreadsheet when calculating the platform edge.

Drawing presentation

If required the calculated edge of the platform can be drawn in the current drawing as a polyline with the following options:

  • In 2D or 3D: Mark the desired radio button.
  • User-definition of layer and colour.
  • Select from the pull down list.
  • For layer, user can select from the pull down list or define new layer name at the field 'Layer'.

Report

The calculated result will be presented in a spreadsheet format.

When pressing the button 'Calculate', a preview of the result is presented in the drawing. The calculated data are also presented in a XLS report, with a column for the following data, presenting the results for all calculated increments:

  • Reference track data:
  • Element information: Refer the topic 'Calculation Parameters and Formulas'.
  • Station number
  • North and East coordinates
  • Elevation
  • Radius in meter
  • Cant, or superelevation data in mm
  • Calculated platform edge data:
  • Horizontal distance from reference track
  • Vertical distance from reference track
  • North and East coordinates from platform edge
  • Elevation from platform edge

When the design is completed, press the button 'Draw' to add the polyline to the current drawing. Cancel ends the session, but exported files are not removed.

Use the button 'Edit existing platform edge <' to modify a platform edge.

Tip: Use the tool 'Setting out -from drawing' tool from Novapoint Base (Refer 'Novapoint Base' to export the 3D polyline data to different file formats.

Tip: Copy the calculated result from the spreadsheet and paste to the current drawing for documentation of platform edge data.

Calculation parameters and formulas

Abbreviations used

* Hp =

Platform design height from reference track

  • Ao = Horizontal platform design distance from reference track
  • Ai = Horizontal offset distance of platform edge of inner side in curve
  • Ay = Horizontal offset distance of platform edge of outer side in curve
  • Hi = Platform edge height of inner side in curve
  • Hy = Platform edge height of outer side in curve
  • Kir

= iR =

Horizontal incremental of inner side in curve

  • Kyr

= yR =

Horizontal incremental of outer side in curve

  • Kp = Curve point
  • OB = Start of transition
  • OE = End of transition
  • SS = Switch stock rail
  • h = Cant / Superelevation
  • X = Varies distance on transition
  • L = Length of transition

General parameter

Figure 1 show the general parameters of platform edge design. All parameters are the offset distance that reference from designed centreline of platform edge.

Figure 01

Figure 02

The distance from the reference track (positioned by default in the middle of the rails) is calculated using the following formulas:

Ai = Ao + Kir =

Ao + iR

Ay = Ao + Kiy = Ao + yR

Platform edge formulas in different case

Track without Cant

* Hi = Hy = Hp when no cant/superelevation

On a straight section

* Ai = Ay =

Ao

In curve section

In the case of straight and curve sections without cant the height of platform is constant with Hp. Calculation of the horizontal increments for platforms at the inner or outer side is based on the following parameters and formulas:

Ay = Ao + Ky = Ao + yR

Ai = Ao + Ki = Ao + iR

The horizontal increments, Kir and Kyr, are defined by a theoretically carriage with length 24.0m, and axle base 18.0m. The curve increments for curves with R >180.0m can then be calculated with the following formulas:

Kir = iR = 81000

2*R Kyr = yR= 63000 2*R

Track sections with transitions

In case of transition sections, the horizontal offset will increase/decrease on this section depending on the length of transition curve. The formula of platform edge is:

Ki =

L + 10 - x

  • Kir [mm]

L + 10 ;

Ky =

L + 15 - x

  • Kyr [mm]

L + 10

Track with Cant

In the case of curve or transition section the height of platform is varying with Hi/Hy. The formulas of horizontal offset of inner and outer side and Hi/Hy of platform are:

Ai =

Ao + Ki +

h

  • Hp

[h in mm]

1500

;

Hi =

Hp - 0.63 * h -

h

  • Ki

[h in mm]

1500

;

Ay =

Ao + Ky -

h

  • (Hp - 375

[h in mm]

1500

;

Hy =

Hp + 1.63 * h -

h

  • Ky

[h in mm]

1500

Transition of platform edge in different situations

In the case of line-curve combination

For line-curve combination the transition of both outer side and inner side of curve element show in the following figure:

In the case of line – spiral – curve combination

For line – spiral – curve combination the transition of both end of curve element show in the following figure:

In the case of a switch in the platform area

When a switch is specified near the new platform the horizontal edge distance calculations will be based at the switch stock rail, SS. Extra widening (Yr) will be added based on the switch radius. In the curve section the extra widening is described for every 0.5m. From SS the platform edge is described with constant widened distance the first 5.0m after SS, and then linear to normal distance 20.0m after SS.

en/np/rail/menu/platform_edge_design.txt · Last modified: 2014/02/14 07:05 by vn_no_rbr